Khloé is THAT person in a movie theater. The Kardashian-Jenner clan screened the premiere of their latest Hulu reality TV show The Kardashians in Los Angeles on Thursday. The night was one of celebration until Khloé Kardashian dramatically yelled “liar” when the face of her ex, Tristan Thompson, popped up on screen. Thompson appears early on into the series reportedly telling Khloé that he was working on regaining her trust. As the episode played in front of a packed audience, a source at the event claimed that “someone in the audience screamed, ‘Liar!'” A second source was able to confirm tha…